I agree casters need to be wrangled in but they aren't
I'm guessing from the strange jumping of that block of text you are responding to someone who blocked me, so apologies if I slightly miss the mark. However, I'm actually not in agreement that casters need nerfed per se.
There are about five or six incredibly "broken" spells that I tend to find need to be limited. Usually by limiting access. If I had to make it into a list...
Limited Access (needs to be gotten as part of a quest): Clone, Simulacrum, Wish -> These spells represent a level of power and agency over the world that they really need to be carefully handled, not just given out for free. I sometimes put things like soul Jar into this as well.
Needs altered -> Wall of Force -> This spell not only shuts down far too many fights, but it also ignores the fantasy associated with it. It needs to have some ability to be broken by large enough damage. Perfect barriers only work on the weak, not the strong.
Just got rid of -> Prismatic Wall -> This thing is just the must stupid thing ever. Unless you just hand a player the spell description, they are never going to be able to break it, and therefore it feels unfair to have the bad guys be able to break it. So it ends up being way more powerful than I feel like it should. I know it is a classic, but I find it badly designed.
But once those are out of the way... then I tend to find casters are sitting in a very good spot. In an all-caster team, the threats feel about right, and the power feels about right, and I don't see a need to actually nerf anything. It all feels good.... unless you have a primary martial, who then can start feeling overwhelmed and less useful. So, to me, the obvious solution is powering up martials, not nerfing casters.